Revolving door



F. W. JOHNSON REVOLVING DOOR Filed June 30,

ug. E, 11933.,

Per

Patented Aug. 1, 1933 REVOLVING DOOR Frederick William` Johnson,Brighton, Englandv VApplication June30, 1932Serial N0..620,131, and

in Great Britain July 13, 1931 4 Claims. (Cx. en -1s) My presentinvention relates to revolving doors, and has for its object to provideanimproved construction of a device for use in conjunction withrevolving doors for automatically returning the door to a predeterminednormal position. In such devices it has been proposed heretofore toprovide tension springs which are` stretched as the door is opened sothat `they reassert themselves and close the door when the door `is l0released.

f According to this invention a device Vfor the purpose set forthcomprises a member with a cam shaped or elliptical track anda loadedmember engaging its said track one of said members moving with the door,the arrangement being that said loaded member is displaced against theinfluence of its load as the door is rotated by reason of the engagementwith said cam shaped or elliptical track so as to store upV energy whichupon 2O release of the door returns the door to the predetermined normalposition.

The preferred form of my invention briey consists in the provision of acam like track with which is engaged a member translatably moved overthe said track when the door is rotated, the

arrangement being that the said member is displaced by reason of itsengagement with the c am shaped track and mechanically applies afload tospring means so as to store up energy therein which upon release ofthedoor sets into operation means for returning the door to apredetei-minednormal position. y

Briefly an embodiment of my invention comprises a pivot to which thedoor is attached, the said pivot having secured to it for rotationtherewith a plate or frame carrying a pair of torsion springs', the saidplate orframe having-f1tted thereto a pair of arms having freeA endsformed with runners engaging a continuous cam shaped or elliptical trackdisposed about the saidplate or frame and spaced therefrom, the saidarms carrying lateral toothed segments or rack bars travellingover gearwheels rotatable on spindles coaxial With said torsion springs andadapted to twist the torsion springs to store `up energy therein whenthe door is rotated by reason of the movement of said arms about theirpivots consequent upon their4 runners travelling over the said camshaped or eccentric track.

In order that my invention may be clearly understood and readily carriedinto effect, I have appended hereto a drawing illustrating an embodimentthereof and wherein,

Fig. 1 is a sectional side elevation View showing an embodiment of myinvention as applied to the upper end of a door. It will be understoodthat by reversalof this device it can also be iitted to the lower `endof the-door. f y Fig. Zfis a plan-view of Fig. 1. Y Fig. 3 is a detailsectional. side elevation View showing a suitable method of supportingthe toothed segments which `operate the torsion springsghereinbeforereferred to. p Referring to the drawing, the spindle to which the centreofthe upperhorizontal edge of the door is aixed is lindicated bythereference numeral 1 andit rotates Within `a casing Z'which is recessedin the ceilingA or super structure of the door. Fixed to the spindle lfor example by being engaged over al square extremity 3 is a plate 4which can Vconveniently be a disc as shown in Fig. 2. The periphery ofthis disc is spaced from a plate 5 which is formed with an ellipticalinner edge `6. The location ofthe disc 4 within the plate 5 is such aslto provide a symmetrical space between them as more clearly shown inFig. 2.k The -plate 5 can be secured within the` casing 2Y by means ofscrews 'l'.which pass vthrough the plate V5 and diagonal supports 8l in.the corners of the casing 2. The eccentric inner edge 6 of the plate 5constitutes a cam track which when the disc or plate 4 is rotated withthe door imparts pivotal oscillation to a pair of arms 9 each pivoted atone end by a bolt 10 to the member 4 vcontiguous tothe periphery of themember 4, the `:other `ends of the arms 9 being'free andcarrying rollers11 the ,peripheries of which are grooved so that they run over the.ellipticaledge `6, the said edge preferably being rounded as shown inFig; 1. The rollers 11 are located upon diametrical opposite sides Yofthe member 4 and are constantly in contact with the edge 6 of the plate5. Normally lthe position occupied bythe plate 4 and rollers 11` is thatindicated in Fig; 2 in which the rollers 11 contact with the oppositepoints of the edge 6 containing the largest diameter of the` ellipse.This normal location is automatically obtained by the influence ofcoiled torsion springs 12 accommodated in sleeves 13 each abutting atone end against a collar 14 and at the other end against a bevel pinion15. Each collar' 14 receives one end of the appropriate coiled torsionspring 12 and is rotatably disposed about a pin 16 and is locked inselected position by Y passing a pin through one of a number of radialholes 17 into` the pin 16. The pin 16 is locked at its outer endA in` aboss 18 by passing a pin through a hole 19 in such boss into one or anumber of holes 20 in the pin 16. Each boss 18 comprises part of abracket or plate 21 secured by screws 22 to the member 4. Y

The ends of the coiled torsion springs remote from the collars 14 areeach vsecured to the appropriate pinion 15, each said pinion being xedon a spindle 23 rotated in a boss 24 of a bracket 25 secured by screws26 to the member 4.

The pinions 15 are rotated sol as to apply a torsional load tothesprings 12 by reason of the `arms 9 being swung inwards as theirrollers 1l travel around the track 6 and this is effected by pivotallyconnecting to the free end of each arm 9 an arcuate toothed rack orsegment 27, the pivotal connection being indicated at 28. toothed rack27 is preferably guided between the appropriate pinions 15 and one ormore rollers 29 supported in bearing members 30 secured to vthe member 4as shown in Fig. 3.

. the 'casing 2, the peripheries of these rollers contacting with themember 4.

It will be appreciated from the foregoing that the iniiuence of thesprings 12 is such as to urge the arms 9 outwards so thatthe rollers llare pressedl against the cam trackV 6 whereby the member 4 is carried tothe position shown in Fig. 2 which for normal purposes can representthat appropriate to the closed vposition of the door. When the door isswung open the arms 9 are necessarily forced inwards and the pinions l5rotated so as to increaseV the torsion of the springs l2 with the resultthat if the door is freed in the open position the springs 12 willreassert themselves Yand-,close the door.` An importantffeature of `myinvention consists in the fact that the door may be rotateda number oftimes in lcontinuous succession without affecting thelfunctionof thespring mechanism for closing the door. The mechanism above proposed willproduce an easy running action Vwhich can s be accommodatedin asmallspace and inwhich thespring means can be readily` adjusted by meansof the collars14`and pins 16.

"1. A device for use in conjunction with revolving doors forautomatically returning-a revolving door to a predeterminednormalposition comprising a member with'a cam shaped track and a. loadedmember-engaging its said track, one of -said members being connectedwith the door and the other being separate from the door so that theone' connected with the door is carried along the other as the door ismoved Vto the'open position, the arrangementl being such that saidloaded Each vmemberis gradually displaced against the influence of itsload as the door is rotated by reason of its engagement with and theshape of the said cam shaped track so as to store up energy which uponrelease of the door returns the door to the closed position.

2. A device for use in conjunction with revolving doors forautomatically returning a revolving door to a predetermined normalposition consisting of a cam like track, a spring for returning the doorto its predetermined normal position and a member engaging the cam liketrack and adapted to set the spring to an operative condition, saidmember being engaged with and translatably moved over the said trackwhen the door is being rotated in the opening direction, the arrangementbeing such that the said member is gradually displaced as the door isbeing opened by reason of vits kengagement with the cam shaped track andmechanically applies a load to said spring so as to store up energytherein which upon re-u lease of the door setsinto operation means forreturning the door to the closed position.

3. A device for use in conjunction with revolving doors forautomatically returning a rcvoiving i door to a predetermined normalposition coinprising a pivot to which the door is attached, a platesecured to the vsaid pivot for rotation therewith, a pair of torsionsprings carried by said plate, a pair of arms fitted to said plate,runners at the free ends of said arms, a continuous substantiallyelliptical track disposed about the said plate and spaced therefrom andengaged by said runners, lateral toothed segments carried by said armsand travelling over gear wheels rotatable on l spindles coaxial withsaid torsion springs and adapted to twist the torsion springs to storeup energy therein when the door is rotated by rea- 'son ofthe movementof said arms about their pivots consequent upon their runners travellingover the said cam shaped or eccentric track.

4. A device for use in conjunction with revolving doors `forautomatically returning a revolving door to a predetermined normalposition cornprising a pivot to which the door is attached, a platesecured to the said pivot for rotation therewith, a pair of torsionsprings carried by said plate, a pair of arms fitted to said plate,runners at the rree ends of said arms, a continuous substantiallyelliptical track disposed about the said plate and spaced therefrom andengaged by said runners, lateral toothed segments carried by said armsand travelling over gear wheels rotatable on spindles coaxial. with saidtorsion springs and adapted to twist the torsion springs to store upenergy therein when the door is rotated by reason of the movement ofsaid arms about their pivots consequent upon their runners travellingover thesaidcam shaped or eccentric track, and

` means for adjusting the torsional eiiort of said springs.

FREDERICK WILLIAM JonNsoN;

liti

